<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning"
                :closable="false"
                show-icon
            >
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row>
                <el-col :span="20">
                    <span>选择商品分类：</span>
                    <el-cascader
                        :options="cateList"
                        :props="cascaderProps"
                        v-model="selectedKeys"
                        @change="handleChange"
                        clearable
                    ></el-cascader>

                </el-col>
            </el-row>
            <!-- tab标签页 -->
            <el-tabs
                v-model="activeName"
                @tab-click="handleClick"
            >
                <el-tab-pane
                    label="动态参数"
                    name="many"
                >
                    <el-button
                        type="primary"
                        :disabled="isBtnDisabled"
                        @click="addDialogVisible=true"
                    >添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table
                        :data="manyTableDate"
                        border
                        stripe
                    >
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag
                                    v-for="(item, i) in scope.row.attr_vals"
                                    :key="i"
                                    closable
                                    @close="handleClose(i,scope.row)"
                                >{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    autofocus
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button
                                    v-else
                                    class="button-new-tag"
                                    size="small"
                                    @click="showInput(scope.row)"
                                >+ New Tag</el-button>
                            </template>

                        </el-table-column>
                        <el-table-column
                            label="序号"
                            type="index"
                            align="center"
                        >
                        </el-table-column>
                        <el-table-column
                            prop="attr_name"
                            label="参数名称"
                            align="center"
                        ></el-table-column>
                        <el-table-column
                            label="操作"
                            align="center"
                        >
                            <template slot-scope="scope">
                                <el-button
                                    type="primary"
                                    icon="el-icon-edit"
                                    size="mini"
                                    @click="showEditDialog(scope.row.attr_id)"
                                >修改</el-button>
                                <el-button
                                    type="danger"
                                    icon="el-icon-delete"
                                    size="mini"
                                    @click="removeParams(scope.row.attr_id)"
                                >删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane
                    label="静态属性"
                    name="only"
                >
                    <el-button
                        type="primary"
                        :disabled="isBtnDisabled"
                        @click="addDialogVisible=true"
                    >添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableDate">
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag
                                    v-for="(item, i) in scope.row.attr_vals"
                                    :key="i"
                                    closable
                                    @close="handleClose(i,scope.row)"
                                >{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    autofocus
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button
                                    v-else
                                    class="button-new-tag"
                                    size="small"
                                    @click="showInput(scope.row)"
                                >+ New Tag</el-button>
                            </template>

                        </el-table-column>
                        <el-table-column
                            label="序号"
                            type="index"
                            align="center"
                        >
                        </el-table-column>
                        <el-table-column
                            prop="attr_name"
                            label="属性名称"
                            align="center"
                        ></el-table-column>
                        <el-table-column
                            label="操作"
                            align="center"
                        >
                            <template slot-scope="scope">
                                <el-button
                                    type="primary"
                                    icon="el-icon-edit"
                                    size="mini"
                                    @click="showEditDialog(scope.row.attr_id)"
                                >修改</el-button>
                                <el-button
                                    type="danger"
                                    icon="el-icon-delete"
                                    size="mini"
                                    @click="removeParams(scope.row.attr_id)"
                                >删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>

        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="`添加${titleText}`"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed"
        >
            <!-- 添加参数的表单 -->
            <el-form
                :model="addForm"
                :rules="addFormRules"
                ref="addFormRef"
                label-width="100px"
            >
                <el-form-item
                    :label="titleText"
                    prop="attr_name"
                >
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span
                slot="footer"
                class="dialog-footer"
            >
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button
                    type="primary"
                    @click="addParams"
                >确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
            :title="`添加${titleText}`"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed"
        >
            <!-- 修改参数的表单 -->
            <el-form
                :model="editForm"
                :rules="editFormRules"
                ref="editFormRef"
                label-width="100px"
            >
                <el-form-item
                    :label="titleText"
                    prop="attr_name"
                >
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span
                slot="footer"
                class="dialog-footer"
            >
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button
                    type="primary"
                    @click="editParams"
                >确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
 
<script>
export default {
    data() {

        return {
            cateList: [],
            // 指定级联选择器的配置对象
            cascaderProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                // checkStrictly: false,
                expandTrigger: 'hover'
            },
            selectedKeys: [],
            // 被激活的标签页的名称
            activeName: 'many',
            // 如果按钮需要被禁用，返回true，否则返回false
            isBtnDisabled: true,
            // 三级分类id
            cateId: [],
            // //动态参数的数据
            manyTableDate: [],
            //静态属性的数据
            onlyTableDate: [],
            // 对话框的title
            titleText: '',
            // 添加对话框的显示和隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: '',
            },
            // 添加参数的表单的校验规则
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' },
                ]
            },
            // 修改对话框的显示和隐藏
            editDialogVisible: false,
            // 修改参数的表单数据对象
            editForm: {},
            // 修改参数的表单的校验规则
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' },
                ]
            },
        }
    },
    created() {
        this.getCateList();
    },
    methods: {
        // 获取商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories');
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败');
            }
            this.cateList = res.data;
        },
        // 选择项发生变化触发这个函数
        handleChange() {
            // 根据所选分类的id，和当前所处的面板，获取对应的参数列表
            this.getParamsList();
        },
        // tab标签页点击事件
        handleClick() {
            this.getParamsList()
        },
        // 获取参数列表
        async getParamsList() {
            // 如果选中的不是三级分类
            if (this.selectedKeys.length !== 3) {
                this.selectedKeys = [];
                // 级联选择器清空时，参数列表数据为空
                this.manyTableDate = [];
                this.onlyTableDate = [];
                this.isBtnDisabled = true;
                return
            }
            // 选中的是三级分类
            this.isBtnDisabled = false;
            // 记录三级分类的id
            this.cateId = this.selectedKeys[2];
            // 根据所选分类的id，和当前所处的面板，获取对应的参数列表
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName }
            });
            if (res.meta.status !== 200) {
                return this.$message.error('获取分类参数列表失败');
            }

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                // 控制文本框的显示和隐藏
                item.inputVisible = false;
                item.inputValue = ''
            })
            if (this.activeName === 'many') {
                this.manyTableDate = res.data;
                this.titleText = '动态参数';
            } else {
                this.onlyTableDate = res.data;
                this.titleText = '静态属性';
            }
        },
        // 监听添加对话框的关闭
        addDialogClosed() {
            this.$refs.addFormRef.resetFields();
        },
        // 点击按钮，添加参数
        addParams() {
            // 判断表单校验是否成功
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return;
                }
                // 发送请求判断是否添加成功
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                }) //直接返回执行的结果
                if (res.meta.status !== 201) {
                    return this.$message.error('添加参数失败');
                }
                // 关闭对话框
                this.addDialogVisible = false;
                // 刷新参数列表
                this.getParamsList();
                this.$message.success('添加参数成功');
            })
        },
        // 点击按钮，展示修改对话框
        async showEditDialog(id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
                params: { attr_sel: this.activeName }
            })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数失败');
            }
            this.editForm = res.data;
            this.editDialogVisible = true;
        },
        // 监听修改对话框的关闭
        editDialogClosed() {
            this.$refs.editFormRef.resetFields();
        },
        // 点击按钮，修改参数
        editParams() {
            // 判断表单校验是否成功
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) {
                    return;
                }
                // 发送请求判断是否修改成功
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                }) //直接返回执行的结果
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败');
                }
                // 关闭对话框
                this.editDialogVisible = false;
                // 刷新参数列表
                this.getParamsList();
                this.$message.success('修改参数成功');
            })
        },
        // 点击按钮，删除参数
        removeParams(id) {
            this.$confirm('确定要删除该参数吗?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(async () => {
                const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`);
                if (res.meta.status !== 200) {
                    return this.$message.error('删除参数失败');
                }
                this.getParamsList();
                this.$message.success('删除参数成功');
            }).catch(() => {
                this.$message.info('已取消删除');
            });
        },
        // 文本框失去焦点，按下enter会 触发
        handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false;
                return
            }
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = '';
            row.inputVisible = false;
            this.saveAttrVals(row)
        },
        // 发送请求，保存attr_vals到数据库
        async saveAttrVals(row) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')

            }) //直接返回执行的结果
            if (res.meta.status !== 200) {
                return this.$message.error('修改参数项失败');
            }
            this.$message.success('修改参数项成功');
        },
        showInput(row) {
            row.inputVisible = true;
            // 让文本框自动获得焦点
            // $nextTick：当页面上元素被重新渲染后，才会指定回调函数中的代码
            this.$nextTick(() => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数项，保存到数据库
        handleClose(i, row) {
            row.attr_vals.splice(i, 1);
            this.saveAttrVals(row);
        }

    },
}
</script>
 
<style lang="less" scoped>
.el-row {
    margin: 15px 0;
}
.el-cascader {
    width: 30%;
}
.el-tag {
    margin: 10px;
}
.el-input {
    margin-left: 10px;
    width: 28%;
}
</style>